My daughter is 7 years old. In most situations, she's a very happy, well-behaved, pleasant girl. She's does excellent in school and gets along well with others. She is somewhat shy and typically takes awhile to warm up to new people and/or situations and she is quite attached to me (her mom) and often wants to be with me. At the same time, once she gets comfortable she is very friendly and outgoing and has many friends.
Since she was toddler, she has demonstrated major tantrums in which she completely loses control, often for long periods of time. We've found nothing that can help her get back under control (time-outs, holding her, rewards/consequences, leaving her alone, etc) and sometimes these tantrums last an hour or two or longer. Although the rate of these tantrums have decreased over the years, the intensity is increasing. She now has them about once a month. When they occur, she now will often hit and kick me. Nothing seems to help her get under control. She refuses to be by herself, but being with her accomplishes nothing. Since she behaves violently to me, I try to get her to take some time to herself, but she refuses to remain on her own and will literally chase me if I try to get away from her. I've even locked myself in a room, in which she just bangs and kicks on the door. These events have lasted as long as 2-3 hours and can be just horrible. They never occur anywhere but home and usually just in front of our family (my husband and I, or her brother), but she recently did one while a friend was over (really scared her friend). After she finally calms down, she is extremely pleasant. One time she acknowledge she'd gotten out of control and said "but I'm okay now." She seems to recognize, after the fact, that her behavior was disproportionate to the problem.
In contrast to her behavior with friends and at school, she can be quite bossy with her younger brother. Often they get along well, but she likes to be in charge, make the rules and have things her way. Although she is usually very pleasant with me, she gets in moods where she is quite disreptful and talks back. Sometimes these behaviors have escalated to a tantrum when things aren't going her way.
I've been at a loss as to where to turn. We've spoken with her physician, but she didn't have a lot to offer. I'm not sure if this is just a maturity issue, if perhaps she has a mental disorder, and I've even wondered if she could have problems with managing her blood sugar as after once incident she was extremely hungry, but 2-3 hours of screaming and crying may do that to you.
I will add that I had this problem as well. It seemed to improve as I got older, but I recall incidences in my teens and 20's. I'm now in my mid-30's and it hasn't occured in years. I'd never recognized the pattern, so never thought to see if there was something I could do about it, but I'm hoping my daughter will not have to deal with this for another 20 years.